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考虑化学反应的激光诱导空化泡的数值研究。

Numerical study of laser-induced cavitation bubble with consideration of chemical reactions.

作者信息

Wang Chengyan, Yan Hong, Zhang Ruifan, Chen Fuzhen, Liu Fan

机构信息

School of power and energy, Northwestern Polytechnical University, Xi'an 710129, PR China.

出版信息

Ultrason Sonochem. 2024 Oct;109:107007. doi: 10.1016/j.ultsonch.2024.107007. Epub 2024 Aug 6.

DOI:10.1016/j.ultsonch.2024.107007
PMID:39111248
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11350508/
Abstract

Cavitation generated during injector jetting can significantly affect fuel atomization. Laser-induced cavitation bubble is an important phenomenon in laser induced plasma ignition technology. Limited by the difficulties in experimental measurements, numerical simulations have become an important tool in the study of laser-induced cavitation bubble, but most previous numerical models used to study the dynamics of laser-induced cavitation bubble usually ignore the effect of chemical reactions. In this study, the finite volume method is used to solve the compressible two-dimensional reynolds averaged Navier-Stokes equation by considering the heat and mass transfer as well as the chemical reactions within the cavitation bubble. The effects of overall reaction and elementary reactions on the cavitation bubble are evaluated, respectively. It is found that by additionally considering chemical reactions within the numerical model, lower maximum temperatures and higher maximum pressures are predicted within the bubble. And the generated non-condensable gases produced by the chemical reactions enhance the subsequent expansion process of the cavitation bubble. Besides, the effect of the one-sided wall boundary condition on cavitation bubble is compared with the infinite boundary condition. Influenced by the wall boundary, the cavitation bubble forms a localized high pressure on the side of the bubble away from the wall during the collapse process, which causes the bubble to be compressed into a "crescent" shape. The maximum pressure and temperature inside the bubble are lower due to localized losses caused by the wall.

摘要

喷油器喷射过程中产生的空化现象会显著影响燃油雾化。激光诱导空化泡是激光诱导等离子体点火技术中的一个重要现象。受实验测量困难的限制，数值模拟已成为研究激光诱导空化泡的重要工具，但以往大多数用于研究激光诱导空化泡动力学的数值模型通常忽略化学反应的影响。在本研究中，采用有限体积法求解可压缩二维雷诺平均纳维-斯托克斯方程，同时考虑空化泡内的传热传质以及化学反应。分别评估了总包反应和基元反应对空化泡的影响。研究发现，通过在数值模型中额外考虑化学反应，预测出泡内的最高温度较低，最高压力较高。并且化学反应产生的不可凝气体增强了空化泡随后的膨胀过程。此外，将单侧壁边界条件对空化泡的影响与无限边界条件进行了比较。受壁边界影响，空化泡在溃灭过程中在远离壁的泡侧形成局部高压，这导致泡被压缩成“月牙”形。由于壁造成的局部损失，泡内的最大压力和温度较低。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/95f2fcc90b0f/gr17.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/95f2fcc90b0f/gr17.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/88ba08893fa7/gr1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/1640a1a99ec4/gr2.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/da4a3f367303/gr3.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/fa30cc12720a/gr4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/69d160a0041b/gr5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/c111794a1404/gr6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/0fb60a32cdd5/gr7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/956a865c7d18/gr8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/4bba0acf78e9/gr9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/1476ccf5f095/gr10.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/1ea164f0edb5/gr11.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/c1f9a7861aaf/gr12.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/9a44599bda00/gr13.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/548f5704316f/gr14.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/dce9e8101349/gr15.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/53967bfb773b/gr16.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5fb4/11350508/95f2fcc90b0f/gr17.jpg

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